15.5+26.5-20.5的简便计算

分类: 作业答案 • 2021-12-28 15:46:50

问题描述：

15.5+26.5-20.5的简便计算

答

=26.5-(20.5-15.5)
=26.5-5
=21.5那15.5+26,5-20.4=15.5+(26.5-20.4) =15.5+6.1 =21.6